linux-kernel - [087/117] sctp: fix potential reference of a freed pointer

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Date:	Mon, 10 May 2010 15:32:58 -0700
From:	Greg KH <gregkh@...e.de>
To:	linux-kernel@...r.kernel.org, stable@...nel.org
Cc:	stable-review@...nel.org, torvalds@...ux-foundation.org,
	akpm@...ux-foundation.org, alan@...rguk.ukuu.org.uk,
	Vlad Yasevich <vladislav.yasevich@...com>,
	"David S. Miller" <davem@...emloft.net>
Subject: [087/117] sctp: fix potential reference of a freed pointer

2.6.33-stable review patch.  If anyone has any objections, please let us know.

------------------


From: Vlad Yasevich <vladislav.yasevich@...com>

[ Upstream commit 0c42749cffbb4a06be86c5e5db6c7ebad548781f ]

When sctp attempts to update an assocition, it removes any
addresses that were not in the updated INITs.  However, the loop
may attempt to refrence a transport with address after removing it.

Signed-off-by: Vlad Yasevich <vladislav.yasevich@...com>
Signed-off-by: David S. Miller <davem@...emloft.net>
Signed-off-by: Greg Kroah-Hartman <gregkh@...e.de>
---
 net/sctp/associola.c |    6 ++++--
 1 file changed, 4 insertions(+), 2 deletions(-)

--- a/net/sctp/associola.c
+++ b/net/sctp/associola.c
@@ -1194,8 +1194,10 @@ void sctp_assoc_update(struct sctp_assoc
 	/* Remove any peer addresses not present in the new association. */
 	list_for_each_safe(pos, temp, &asoc->peer.transport_addr_list) {
 		trans = list_entry(pos, struct sctp_transport, transports);
-		if (!sctp_assoc_lookup_paddr(new, &trans->ipaddr))
-			sctp_assoc_del_peer(asoc, &trans->ipaddr);
+		if (!sctp_assoc_lookup_paddr(new, &trans->ipaddr)) {
+			sctp_assoc_rm_peer(asoc, trans);
+			continue;
+		}
 
 		if (asoc->state >= SCTP_STATE_ESTABLISHED)
 			sctp_transport_reset(trans);


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